The Lord [is] my strength and song
It being in the name of the Lord the enemies of the psalmist were destroyed; and having obtained help of him when sore thrust at, he gives him all the glory, and ascribes nothing to himself. It was the Lord that strengthened him, helped him, and gave him the victory. The Lord is the author and giver of strength, natural and spiritual; he is the "strength" of the hearts and lives of his people, and of their salvation; and therefore is their "song", the matter of it: they sing of his nature and perfections, of his works of providence and grace, of his righteousness and salvation, as follows:
and is become my salvation;
the author of temporal, spiritual, and eternal salvation; which the psalmist saw his interest in, and was assured of, and therefore sung praise on that account; see ( Exodus 15:2 ) ( Isaiah 12:2 ) .